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Alkali lignin micro-nanosphere/paper-based adsorption material, preparation method thereof and application of alkali lignin micro-nanosphere/paper-based adsorption material in dye wastewater treatment

A technology of alkali lignin and micro-nanospheres, which is applied in the fields of adsorption water/sewage treatment, water/sludge/sewage treatment, energy and wastewater treatment, etc. Broad market prospects, large specific surface area, and the effect of not easy to agglomerate

Active Publication Date: 2021-06-29
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In the prior art, most of the lignin-based adsorption materials are made of lignin under high temperature conditions to make porous activated carbon, but in this process, the original oxygen-containing functional groups in lignin molecules will be converted into CO2 at high temperature. 2 , the reduction of the content of functional groups on lignin carbon that play a role in adsorption limits the adsorption performance of lignin porous carbon, and the preparation process of lignin porous carbon requires high energy consumption, thus hindering the practical application
[0011] At present, most alkali lignin adsorption materials are in a highly aggregated state in aqueous solution, with a small specific surface area. A large number of adsorbable sites are embedded in the lignin and cannot perform adsorption, thus limiting its adsorption performance and thus cannot be efficiently adsorbed. waste water treatment
In addition, the alkali lignin adsorption materials prepared in the prior art are difficult to reuse, the cost of use is high, the adsorption effect is poor, the service life is short, and it is not easy to recycle.

Method used

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  • Alkali lignin micro-nanosphere/paper-based adsorption material, preparation method thereof and application of alkali lignin micro-nanosphere/paper-based adsorption material in dye wastewater treatment
  • Alkali lignin micro-nanosphere/paper-based adsorption material, preparation method thereof and application of alkali lignin micro-nanosphere/paper-based adsorption material in dye wastewater treatment
  • Alkali lignin micro-nanosphere/paper-based adsorption material, preparation method thereof and application of alkali lignin micro-nanosphere/paper-based adsorption material in dye wastewater treatment

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Embodiment 1

[0070] A method for preparing alkali lignin micro-nanospheres / paper-based adsorption material in this embodiment, the method specifically includes the following steps:

[0071] (1) Purification: Fully dissolve industrial alkali lignin in aqueous sodium hydroxide solution with pH=12, stir for 2 hours, and filter with suction to remove insoluble impurities; Adjust to 2 to fully separate the alkali lignin; filter with suction, wash the obtained filter residue with deionized water until neutral, dry the filter residue at -40°C for 12 hours to constant weight, and grind to obtain 40-60 μm purified alkali lignin white.

[0072] (2) Activation: Potassium persulfate and ammonium ferrous sulfate are dissolved in deionized water according to the proportioning ratio to obtain an initiator solution; then an appropriate amount of purified alkali lignin obtained in step (1) is added to a three-necked flask; Add all the initiator solution into the three-necked flask, raise the temperature o...

Embodiment 2

[0077] A method for preparing alkali lignin micro-nanospheres / paper-based adsorption material in this embodiment, the method specifically includes the following steps:

[0078] (1) Purification: Fully dissolve industrial alkali lignin in aqueous sodium hydroxide solution with pH=12, stir for 2 hours, and filter with suction to remove insoluble impurities; Adjust to 2 to fully separate the alkali lignin; filter with suction, wash the obtained filter residue with deionized water until neutral, dry the filter residue at -40°C for 12 hours to constant weight, and grind to obtain 40-60 μm purified alkali lignin white.

[0079] (2) Activation: Potassium persulfate and ammonium ferrous sulfate are dissolved in deionized water according to the proportioning ratio to obtain an initiator solution; then an appropriate amount of purified alkali lignin obtained in step (1) is added to a three-necked flask; Add all the initiator solution into the three-necked flask, raise the temperature o...

Embodiment 3

[0083] A method for preparing alkali lignin micro-nanospheres / paper-based adsorption material in this embodiment, the method specifically includes the following steps:

[0084] (1) Purification: fully dissolve industrial alkali lignin in aqueous sodium hydroxide solution with pH=11, stir for 3 hours, and filter with suction to remove insoluble impurities; Adjust to 2.5 to fully separate the alkali lignin; filter with suction, wash the resulting filter residue with deionized water until neutral, dry the filter residue at -40°C for 12 hours to constant weight, and grind to obtain 40-60 μm purified alkali lignin white.

[0085] (2) Activation: Potassium persulfate and ammonium ferrous sulfate are dissolved in deionized water according to the proportioning ratio to obtain an initiator solution; then an appropriate amount of purified alkali lignin obtained in step (1) is added to a three-necked flask; Add all the initiator solution into the three-necked flask, raise the temperatur...

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Abstract

The invention discloses an alkali lignin micro-nanosphere / paper-based adsorption material, a preparation method thereof and application of the alkali lignin micro-nanosphere / paper-based adsorption material in dye wastewater treatment. The preparation method comprises the following steps that firstly, potassium persulfate and ammonium ferrous sulfate are used as initiators to improve the group activity of alkali lignin; then stearoyl chloride is used as an esterification reagent, N, N-dimethylformamide is used as a solvent, triethylamine is used as an acid applying agent and a catalyst, and the acetylation degree of the alkali lignin is controlled by controlling the ratio of stearoyl chloride to the alkali lignin; tetrahydrofuran is used as a solvent, cyclohexane is used as an anti-solvent, and the alkali lignin micro-nanospheres are prepared on filter paper in situ through a self-assembly method. The alkali lignin micro-nanospheres prepared by the method are micro-nano spherical reverse micelles with hydrophobic surfaces and hydrophilic interiors, can be well dispersed on water or a loading material, and are not easy to agglomerate. In addition, the adsorption material disclosed by the invention can be made into various shapes, is convenient to use and efficient in adsorption, can be recycled and reused, and is low in cost.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials and dye wastewater treatment, and in particular relates to an alkali lignin micronanosphere / paper-based adsorption material, a preparation method thereof and an application in treating dye wastewater. Background technique [0002] Papermaking and printing and dyeing industries will discharge high-content organic pollutants, dark-colored and highly alkaline wastewater. How to effectively treat these wastewaters has become a major issue and challenge of global concern. Rhodamine B is an aromatic heterocyclic compound commonly used in hemp, silk fabrics, cotton cloth, paper, bamboo and wood coloring, and has a wide range of uses. Dye wastewater containing rhodamine B has high concentration, deep color, high toxicity, and has a great impact on environmental sanitation and human safety. The pollution caused by dye wastewater containing rhodamine B has become a serious environmental problem...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30
CPCB01J20/24B01J20/22C02F1/28C02F2101/308Y02W10/37
Inventor 赵会芳邱苏鹏郭大亮李静
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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